Eccentric-strap construction for pumping powers



. EJE. GRE-VE v761,389

ECCENTRIG. STRAP NSTRUCTION` FOR vPUMPING' POWERS June V3,'` 1930.

Filed Feb. 27; 1928 INVENTOR Patented June 3,1930

UNITED STATESv PATENT OFFICE EDGAR E. GREVE, OF BELLEVUE, PENNSYLVANIA, ASSIGNOR TO OIL WELL SUPPLY COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA ECCENTRIC-STRAP CONSTRUCTION FOR PUMPIN G POWERS Application filed February 27, 1928. Serial No. 257,497. i

My invention relates to apparatus known as pumping powers employed for pumping oil and gas wells, and more particularly to a new and improved eccentric strap construction employed in such apparatus.

The present invention is especially designed to be used in connection with apparatus of the character above mentioned and known as the under pull type, i. e., in which t the rods employed are connected with eccentrics located below the band wheel and on the hub thereof; and in which the power is transmitted by means of a belt which runs on the band wheel.

The prime object of the present invention is provide a simple and eiiicient eccentric strap construction embodying anti-friction bearings and means for eifectively lubricating the parts.

In the accompanying drawings, which illustrate an application of my invention:

Fig. 1 is an elevational view of a portion of a pumping power unit embodying my invention; A s

Fig. 2, a top plan View of a hub and strap construction constituting an eccentric construct-ed in accordance with my invention; and

F ig. 3, a horizontal sectional View taken on line III-III of Fig. 2.

Referring to the drawings, 5 indicates a suitable foundation upon which the band wheel power structure is mounted, the base 6 of said structure being anchored to the foundation by anchor rods 7. 8 designates the band wheel having a hub 9 designed to be mounted on a vertically extending shaft extending downwardly into the base, as usual. Upon this hub, a plurality of eccentrics, designated generally by the numeral 10, are mounted.

The eccentric construction or device 10 constituting my invention and as' illustrated and as preferred, includes a plate-like member 11 having an eccentrically disposedhub portion 12 and an annular peripheral portion 13, the latter being provided or formed with a chamber or race-way 14 adapted to receive a portion of a strap member and anti-friction bearings, as hereinafter described. The hub 12 is mounted on and keyed to the vertically extending hub 9 of the band wheel.

15 'designates the strap of the eccentric structure. This strap is loosely mounted on the peripheral portion 13 of plate member 11, and has an annular depending member or element 16 entered in the race-way or annular chamber 14. Said strap is also formed with an annular extension 17 spaced from the annular member 16 to form a space or groove 18 therebetween. Member 17 is formed with any desired number of openings 19, by means of which eccentric strap connections, as rods 20, for example, may be attached thereto in the usual manner.

.Located within the race-way or chamber 14, and disposed between a wall a thereof and a bearing face Z) of annular member 16, I provide anti-friction roller bearings 21. Said bearings 21 are maintained in the desiredoperative position within the race-way between a race-plate 22 and an annular retaining plate or ring 23,-th-e latter' being secured, when in position, to the eccentric proper by means of headed and threaded y bolts 24.

Grease, oil, or other suitable lubricant may be introduced to the chamber or race-way 14 through openings formed in the ring 23. In the drawings, I have shown four such openings closed by filler plugs 25. The lubricant is prevented from escaping from chamber 14 by the employment of grooves 26 formed in a shoulder 27 of the peripheral portion 13 of plate 11. Y

It will be noted that the retaining ring 23 and the strap member are provided with cooperating shoulders 29 and 30, and that the said shoulders, together with the grooved shoulder 27, provide efficient sealing means for the chamber 14, Vpreventing the entrance of foreign matter' thereto and the escape of the lubricant therefrom.

I claim:

1. An eccentric strap construction of the character described including a plate having an eccentrically disposed hub and an annular chamber, a strap mounted on the plate, said strap having outer and inner annnlar depending portions straddling the outer Wall of the chamber, anti-friction bearings in the chamber, and closure means for said chamber.

2. An eccentric strap construction of the character described including a plate having an eccentrically disposed hub and an annular peripheral chamber7 a strap mounted on the plate and having an annular depending member entered in the chamber, anti-friction means disposed in the chamber between a Wall thereof and the depending member of the strap, a ring member carried by the plate and co-acting interlocking means on the ring and strap.

3. An eccentric strap construction of the character described including a plate having an eccentrically disposed hub and an annular peripheral chamber, a strap mounted on the plate and having an annular depending member entered in the chamber, antifriction means disposed in the chamber between a Wall thereof and the depending member of the strap7 and closure means for the chamber.

4l. The combination with a power device of the character described having a band Wheel and a vertically extending hub portion.7 of a pair of eccentric strap constructions mounted on the said hub portion below the band Wheel, said eccentric strap constructions each including a plate having an eccentrically disposed hub surrounding the band Wheel hub and an annular chamber, a strap mounted on said plate and having an annular depending portion entered in the chamber and anti-friction bearings interposed between t-he plate and the strap, and closure means for the chamber.

In testimony whereof I aix my signature.

EDGAR E. GREVE. 

